| Alba Iulia to Oberkirch | 743.98 mi (1,197.32 km) |
| Alba Iulia to Obernburg am Main | 715.33 mi (1,151.21 km) |
| Alba Iulia to Obernkirchen | 778.71 mi (1,253.22 km) |
| Alba Iulia to Oberschleissheim | 583.07 mi (938.37 km) |
| Alba Iulia to Oberstdorf | 635.34 mi (1,022.48 km) |
| Alba Iulia to Obertraubling | 567.87 mi (913.91 km) |
| Alba Iulia to Obertshausen | 732.84 mi (1,179.40 km) |
| Alba Iulia to Oberursel | 746.42 mi (1,201.25 km) |
| Alba Iulia to Ochsenfurt | 671.99 mi (1,081.47 km) |
| Alba Iulia to Ochsenhausen | 654.91 mi (1,053.98 km) |
| Alba Iulia to Ochtrup | 850.53 mi (1,368.79 km) |
| Alba Iulia to Odenthal | 824.71 mi (1,327.24 km) |
| Alba Iulia to Oelde | 802.84 mi (1,292.05 km) |
| Alba Iulia to Oelsnitz | 603.76 mi (971.66 km) |
| Alba Iulia to Oer-Erkenschwick | 833.39 mi (1,341.22 km) |
